Suarez is a nutcase but he tends to channel his craziness into an obsession to win on the field. And he has meltdowns because he can't handle defeats (not just in terms of game result but also the individual battles). Balotelli is incredibly talented but his craziness isn't as constructive as Suarez. He becomes disinterested when he has lost the plot whereas Suarez is always busy and working for the team.
The only sympathy I have on that front is that I don't think anywhere he has been so far has had the right environment. Either in racist Italy or the Man City circus. Still he's 23 and has won 4 league titles and a champions league. If he's willing to accept reasonable wages and Milan accept a lower fee, I don't think he would be any more of a problem than Bendtner if things go tits up. And if they don't, we've got a top quality striker capable of scoring goals from chances that don't exist. Wenger doesn't seem keen though, which is fair enough. We've got our marquee forward anyway.